Table 4
Completeness of the final arc candidat sample listed in Tables 2, 3, comparing the results obtained before and after the colour selection.
| arcf. (a) | arcf. seg. (b) | visual only (c) | all | |
|
|
||||
| before col. sel. | 29 | 20 | 41 | 90 |
| after col. sel. | 24 | 17 | 15 | 56 |
|
|
||||
| completeness | 83% | 85% | 37% | 62% |
Notes. Columns refer to the objects detected by the arcfinder (arcf., labelled a), those segmented but not recognised as arcs by the arcfinder (arcf. seg., labelled b), those identified with the visual inspection only (visual only, labelled c in the sample catalogue) and the complete sample (all). This shows that the colour selection looses only 17% of the single-band arcfinder sample (first column). The loss is greater when the visual detections are included, 48%, since many of them have poor photometry because they are blended, faint or fragmented (last column).
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